diff --git a/README.md b/README.md
index 78aee62..d2e618a 100644
--- a/README.md
+++ b/README.md
@@ -42,8 +42,8 @@ if err != nil {
 * [x] GET /api/v1/blocks
 * [x] GET /api/v1/favourites
 * [x] GET /api/v1/follow_requests
-* [ ] POST /api/v1/follow_requests/authorize
-* [ ] POST /api/v1/follow_requests/reject
+* [ ] POST /api/v1/follow_requests/:id/authorize
+* [ ] POST /api/v1/follow_requests/:id/reject
 * [x] POST /api/v1/follows
 * [x] GET /api/v1/instance
 * [ ] POST /api/v1/media
diff --git a/accounts.go b/accounts.go
index ee9cec3..8238791 100644
--- a/accounts.go
+++ b/accounts.go
@@ -241,3 +241,13 @@ func (c *Client) GetFollowRequests() ([]*Account, error) {
 	}
 	return accounts, nil
 }
+
+// FollowRequestAuthorize is authorize the follow request of user with id.
+func (c *Client) FollowRequestAuthorize(id int64) error {
+	return c.doAPI(http.MethodPost, fmt.Sprintf("/api/v1/follow_requests/%d/authorize", id), nil, nil)
+}
+
+// FollowRequestReject is rejects the follow request of user with id.
+func (c *Client) FollowRequestReject(id int64) error {
+	return c.doAPI(http.MethodPost, fmt.Sprintf("/api/v1/follow_requests/%d/reject", id), nil, nil)
+}
diff --git a/accounts_test.go b/accounts_test.go
index e7bc167..b891225 100644
--- a/accounts_test.go
+++ b/accounts_test.go
@@ -129,7 +129,13 @@ func TestAccountUnfollow(t *testing.T) {
 }
 
 func TestGetFollowRequests(t *testing.T) {
+	canErr := true
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if canErr {
+			canErr = false
+			http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+			return
+		}
 		fmt.Fprintln(w, `[{"Username": "foo"}, {"Username": "bar"}]`)
 		return
 	}))
@@ -141,6 +147,10 @@ func TestGetFollowRequests(t *testing.T) {
 		ClientSecret: "bar",
 		AccessToken:  "zoo",
 	})
+	_, err := client.GetFollowRequests()
+	if err == nil {
+		t.Fatalf("should be fail: %v", err)
+	}
 	fReqs, err := client.GetFollowRequests()
 	if err != nil {
 		t.Fatalf("should not be fail: %v", err)
@@ -155,3 +165,51 @@ func TestGetFollowRequests(t *testing.T) {
 		t.Fatalf("want %q but %q", "bar", fReqs[0].Username)
 	}
 }
+
+func TestFollowRequestAuthorize(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/api/v1/follow_requests/1234567/authorize" {
+			http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
+		}
+	}))
+	defer ts.Close()
+
+	client := NewClient(&Config{
+		Server:       ts.URL,
+		ClientID:     "foo",
+		ClientSecret: "bar",
+		AccessToken:  "zoo",
+	})
+	err := client.FollowRequestAuthorize(123)
+	if err == nil {
+		t.Fatalf("should be fail: %v", err)
+	}
+	err = client.FollowRequestAuthorize(1234567)
+	if err != nil {
+		t.Fatalf("should not be fail: %v", err)
+	}
+}
+
+func TestFollowRequestReject(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/api/v1/follow_requests/1234567/reject" {
+			http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
+		}
+	}))
+	defer ts.Close()
+
+	client := NewClient(&Config{
+		Server:       ts.URL,
+		ClientID:     "foo",
+		ClientSecret: "bar",
+		AccessToken:  "zoo",
+	})
+	err := client.FollowRequestReject(123)
+	if err == nil {
+		t.Fatalf("should be fail: %v", err)
+	}
+	err = client.FollowRequestReject(1234567)
+	if err != nil {
+		t.Fatalf("should not be fail: %v", err)
+	}
+}
diff --git a/mastodon.go b/mastodon.go
index 3cdf902..19b452e 100644
--- a/mastodon.go
+++ b/mastodon.go
@@ -44,12 +44,11 @@ func (c *Client) doAPI(method string, uri string, params url.Values, res interfa
 		return err
 	}
 	defer resp.Body.Close()
-	if res == nil {
-		return nil
-	}
 
-	if method == http.MethodGet && resp.StatusCode != http.StatusOK {
+	if resp.StatusCode != http.StatusOK {
 		return fmt.Errorf("bad request: %v", resp.Status)
+	} else if res == nil {
+		return nil
 	}
 
 	return json.NewDecoder(resp.Body).Decode(&res)